/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffect.h
Determines if the magnitude can be properly calculated with the specified gameplay effect spec (could fail if relying on an attribute not present, etc.)
Whether or not the magnitude can be properly calculated
bool CanCalculateMagnitude ( const [FGameplayEffectSpec](API\Plugins\GameplayAbilities\FGameplayEffectSpec) & InRelevantSpec ) const